umbilical artery Doppler
Also written as: UA Doppler — umbilical artery Doppler ultrasound
Ultrasound assessment measuring blood flow patterns in the umbilical arteries to evaluate placental function and fetal well-being.
Full Definition
A specialized ultrasound technique that uses Doppler technology to assess blood flow velocity and resistance patterns in the umbilical arteries connecting the fetus to the placenta. The examination measures systolic and diastolic flow velocities, calculating indices such as the pulsatility index and resistance index to evaluate placental vascular resistance. Abnormal findings, including absent or reversed end-diastolic flow, indicate placental insufficiency and increased perinatal morbidity risk. This non-invasive surveillance tool is essential in managing high-risk pregnancies, particularly those complicated by fetal growth restriction, hypertensive disorders, or multiple gestations.
Usage
Usage note: Commonly abbreviated as UA Doppler in clinical notes; specify which umbilical artery when documenting unilateral abnormalities.
In Context
- "Serial umbilical artery Doppler studies showed progressively increasing resistance indices concerning for placental insufficiency." — Maternal-fetal medicine consultation
- "The umbilical artery Doppler demonstrated normal flow patterns with appropriate diastolic flow throughout the study period." — Ultrasound report